The size of the volcanoes on Mars indicate that Mars has a(n) ____________________ crust than Earth
Fill in the blank(s) with correct word
thicker
stronger
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Why was it thought that Titan may have oceans of methane?
A) Titan's atmosphere contains traces of methane. Similarly, Earth's atmosphere contains traces of water vapor. So, scientist thought Titan should have methane oceans. B) The atmospheric pressure at Titan's surface and its surface temperature are such that methane should be liquid on Titan's surface. C) The abundance of hydrocarbons in the atmosphere of Titan, led scientists to believe that Titan had an abundance of methane on its surface. D) Titan's atmosphere is like Earth's (mostly nitrogen), but its temperature is too low for water to be in the liquid phase. The only other possible liquid was methane. E) Since Saturn has methane ice in its atmosphere, methane should be abundant in this region of the solar system. The sheer abundance of methane in the region led scientists to hypothesize methane oceans on Titan.
Which of the following items would not be considered "dark matter" by astronomers?
A) basketballs B) black holes C) weakly interacting massive particles D) red giants E) people
When a body moves in circular motion at constant speed, the velocity and acceleration point __________
Fill in the blank(s) with correct word
With no air resistance, a projectile fired at 60° has the same range as if it were fired at
A) 15°. B) 30°. C) 45°. D) 75°.